EN 15425:2023

Adhesives - One component polyurethane (PUR) for load-bearing timber structures - Classification and performance requirements

This document establishes a classification for one component polyurethane (PUR) adhesives according to their suitability for use in load-bearing timber products in defined climatic exposure conditions, and specifies performance requirements for such adhesives for the factory manufacture or factory-like manufacturing of load-bearing timber products only.
It also classifies “adhesive product lines” where all the products within the line have the same chemical composition except for a different amount of catalyst.
This document only specifies the performance of adhesives for use in an environment corresponding to the defined conditions.
The performance requirements of this document are applicable to the adhesives only, not to the manufactured timber products. This document does not cover the performance of adhesives for on-site gluing (except for factory-like conditions) or the production of wood-based panels, except solid wood panels, or modified and stabilized wood with considerably reduced swelling and shrinkage properties, e.g. acetylated wood, heat treated wood and polymer impregnated wood.
This document is primarily intended for use by adhesive manufacturers and for use in timber products bonded with adhesives, to assess or control the quality of adhesives. The requirements are applicable to the type testing of the adhesives. Production control activities are outside the scope of this document.
Adhesives meeting the requirements of this document are adequate for use in load-bearing timber products, provided that the bonding process has been carried out according to an appropriate product standard.
This document does not address the classification and use of adhesives in combination with the spraying of water before or during the bonding process; see informative Annex C of this document.
This does neither allow nor forbid the use of adhesives in combination with the spraying of water.

Klebstoffe - Einkomponenten-Klebstoffe auf Polyurethanbasis (PUR) für tragende Holzbauteile - Klassifizierung und Leistungsanforderungen

Dieses Dokument stellt eine Klassifizierung für Einkomponenten-Klebstoffe auf Polyurethanbasis (PUR) entsprechend ihrer Eignung zur Verwendung für tragende Holzbauteile unter bestimmten Klimabedingungen auf und legt die Leistungsanforderungen an derartige Klebstoffe ausschließlich zur werksmäßigen Herstellung oder Herstellung unter werksähnlichen Bedingungen von tragenden Holzbauteilen fest.
Darüber hinaus werden "Klebstoffproduktlinien" klassifiziert, bei denen alle Produkte innerhalb der Linie die gleiche chemische Zusammensetzung haben, abgesehen von einer unterschiedlichen Menge an Katalysator.
Dieses Dokument legt nur das Leistungsverhalten von Klebstoffen für den Einsatz in einer Umgebung fest, die den festgelegten Bedingungen entspricht.
Die Leistungsanforderungen in diesem Dokument sind lediglich für den Klebstoff, nicht für das Holzbauteil anzuwenden. Dieses Dokument behandelt weder das Leistungsverhalten von Klebstoffen für die Vor-Ort-Verklebung (ausgenommen bei werksähnlichen Bedingungen) noch die Produktion von Holzwerkstoffen, ausgenommen Massivholzplatten. Es ist nicht für modifiziertes und vergütetes Holz mit beträchtlich verringerten Quellungs- und Schwindungseigenschaften anzuwenden, wie z. B. acetyliertes Holz, wärmebehandeltes Holz und mit Kunstharz imprägniertes Holz.
Dieses Dokument ist in erster Linie für die Verwendung durch die Hersteller der Klebstoffe und der verklebten Holzprodukte bestimmt, um die Qualität von Klebstoffen zu beurteilen oder zu überprüfen. Die Anforderungen sind für die Typprüfung von Klebstoffen anzuwenden. Aktivitäten im Rahmen der Produktionskontrolle gehören nicht zum Anwendungsbereich dieses Dokuments.
Klebstoffe, die die Anforderungen dieses Dokuments erfüllen, sind für den Einsatz in tragenden Holzprodukten geeignet, vorausgesetzt, dass der Verklebungsvorgang nach einer entsprechenden Produktnorm vorgenommen wurde.
Dieses Dokument behandelt nicht die Klassifizierung und Verwendung von Klebstoffen in Kombination mit dem Besprühen mit Wasser vor oder während des Verklebungsvorgangs. Siehe hierzu den informativen Anhang C dieses Dokuments.
Dies gestattet oder verbietet nicht die Verwendung von Klebstoffen in Kombination mit dem Besprühen mit Wasser.

Adhésifs - Adhésifs polyuréthane monocomposants (PUR) pour structures portantes en bois - Classification et exigences de performance

Le présent document établit une classification des adhésifs polyuréthane monocomposants (PUR) en fonction de leur aptitude à l’emploi dans les structures portantes en bois dans des conditions d’exposition climatique définies, et spécifie les exigences de performance applicables à ces adhésifs uniquement lorsqu’ils sont utilisés pour la fabrication en usine de structures portantes en bois, ou dans des conditions semblables à la fabrication en usine.
Il classifie également les « gammes de produits adhésifs » dont les produits présentent tous la même composition chimique, à l’exception de la quantité de catalyseur.
Le présent document spécifie la performance des adhésifs uniquement dans l’environnement correspondant aux conditions définies.
Les exigences relatives à la performance définies dans le présent document ne s’appliquent qu’aux adhésifs et non aux produits manufacturés en bois. Le présent document ne couvre pas la performance des adhésifs utilisés pour le collage sur site (à l’exception des conditions semblables à la fabrication en usine) ou pour la fabrication de panneaux à base de bois, à l’exception des panneaux en bois massif, ou pour le bois modifié et stabilisé ayant une propension considérablement réduite au gonflement et au retrait, par exemple le bois acétylé, le bois traité à la chaleur et le bois imprégné de polymère.
Le présent document s’adresse avant tout aux fabricants d’adhésifs pour leur permettre, dans le domaine des produits en bois collés, d’évaluer ou de contrôler la qualité des adhésifs. Les exigences s’appliquent aux essais de type des adhésifs. Les activités de contrôle de la production ne relèvent pas du domaine d’application du présent document.
Les adhésifs répondant aux exigences du présent document conviennent à une utilisation dans des structures portantes en bois, à condition que le processus de collage ait été réalisé conformément à une norme de produit appropriée.
Le présent document n’a pas pour objet la classification ni l’utilisation d’adhésifs en combinaison avec l’aspersion d’eau avant ou pendant le processus de collage ; voir l’Annexe C informative du présent document.
Il ne permet pas ni n’interdit l’utilisation d’adhésifs en combinaison avec l’aspersion d’eau.

Lepila - Enokomponentni poliuretan (PUR) za nosilne lesene konstrukcije - Razvrstitev in zahtevane lastnosti

General Information

• Status: Published
• Publication Date: 30-May-2023
• ICS: 83.180 - Adhesives
• Technical Committee: CEN/TC 193 - Adhesives
• Drafting Committee: CEN/TC 193/SC 1/WG 4 - Tests for 'Novel' load bearing adhesives for wood
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-Feb-2023
• Due Date: 19-Aug-2023
• Completion Date: 15-Feb-2023
• Ref Project: SIST EN 15425:2023 - Adhesives - One component polyurethane (PUR) for load-bearing timber structures - Classification and performance requirements

Relations

• Replaces: EN 15425:2017 - Adhesives - One component polyurethane (PUR) for load-bearing timber structures - Classification and performance requirements
• Effective Date: 18-Sep-2019

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 15425:2023
01-april-2023
Lepila - Enokomponentni poliuretan (PUR) za nosilne lesene konstrukcije -
Razvrstitev in zahtevane lastnosti

Adhesives - One component polyurethane (PUR) for load-bearing timber structures -

Classification and performance requirements
Klebstoffe - Einkomponenten-Klebstoffe auf Polyurethanbasis (PUR) für tragende
Holzbauteile - Klassifizierung und Leistungsanforderungen

Adhésifs - Adhésifs polyuréthane monocomposants (PUR) pour structures portantes en

bois - Classification et exigences de performance
Ta slovenski standard je istoveten z: EN 15425:2023
ICS:
83.180 Lepila Adhesives
91.080.20 Lesene konstrukcije Timber structures
SIST EN 15425:2023 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 15425:2023
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SIST EN 15425:2023
EN 15425
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2023
EUROPÄISCHE NORM
ICS 83.180 Supersedes EN 15425:2017
English Version
Adhesives - One component polyurethane (PUR) for load-
bearing timber structures - Classification and performance
requirements

Adhésifs - Adhésifs polyuréthane monocomposants Klebstoffe - Einkomponenten-Klebstoffe auf

(PUR) pour structures portantes en bois - Classification Polyurethanbasis (PUR) für tragende Holzbauteile -

et exigences de performance Klassifizierung und Leistungsanforderungen
This European Standard was approved by CEN on 18 December 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15425:2023 E

worldwide for CEN national Members.
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SIST EN 15425:2023
EN 15425:2023 (E)
Contents Page

European foreword ............................................................................................................................................ 4

Introduction .......................................................................................................................................................... 5

1 Scope .......................................................................................................................................................... 6

2 Normative references .......................................................................................................................... 6

3 Terms and definitions ......................................................................................................................... 7

4 Classification........................................................................................................................................... 8

5 Requirements ....................................................................................................................................... 11

5.1 General.................................................................................................................................................... 11

5.2 Bond strength in longitudinal tensile shear test ..................................................................... 12

5.3 Resistance to delamination ............................................................................................................. 13

5.4 Tensile strength perpendicular to the bond line after climatic treatment (acid damage

test) .......................................................................................................................................................... 13

5.5 Effect of wood shrinkage on the shear strength ...................................................................... 13

5.6 Static load test of multiple bond line specimens in compression shear ......................... 13

5.7 Creep deformation test at cyclic climate conditions with specimens loaded in bending

shear ........................................................................................................................................................ 14

5.7.1 Application area “Finger-jointing” – close contact glue line in test .................................. 14

5.7.2 Application area “General purpose” – 0,3 mm glue line thickness in test ...................... 14

5.7.3 Application area “Special purpose” – 0,5 mm glue line thickness in test ....................... 14

5.8 Long-term sustained load test at cyclic climate conditions with specimens loaded

perpendicular to the bond line (“Glass house test”) .............................................................. 14

5.9 Delamination test on finger-jointed test pieces....................................................................... 14

6 Test methods ........................................................................................................................................ 15

6.1 General.................................................................................................................................................... 15

6.2 Determination of longitudinal tensile shear strength .......................................................... 15

6.3 Determination of resistance to delamination .......................................................................... 15

6.4 Determination of tensile strength perpendicular to the bond line after climatic

treatment (acid damage test) ......................................................................................................... 15

6.5 Determination of the effect of wood shrinkage on the shear strength............................ 15

6.6 Static load test of multiple bond line specimens in compression shear ......................... 15

6.7 Creep deformation test with specimens loaded in bending shear .................................... 16

6.8 Long-term sustained load test at cyclic climate conditions with specimens loaded

perpendicular to the bond line (“Glass house test”) .............................................................. 16

6.9 Delamination test on finger-jointed test pieces....................................................................... 16

7 Working properties of the adhesive ............................................................................................ 16

7.1 General.................................................................................................................................................... 16

7.2 Determination of initial viscosity under reference conditions .......................................... 16

7.3 Determination of open assembly time under reference conditions ................................ 16

7.4 Determination of pressing time under reference conditions ............................................. 17

8 Marking and labelling ....................................................................................................................... 17

Annex A (normative) Climatic treatment prior to shear test ............................................................. 18

Annex B (normative) Delamination test for bonding of finger-joints............................................. 19

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SIST EN 15425:2023
EN 15425:2023 (E)

B.1 Production of the specimens .......................................................................................................... 19

B.2 Testing .................................................................................................................................................... 20

B.3 Expression of results ......................................................................................................................... 21

B.4 Test report ............................................................................................................................................ 21

B.4.1 Adhesive ................................................................................................................................................. 21

B.4.2 Preparation of test pieces and testing procedure .................................................................. 21

B.4.3 Test results............................................................................................................................................ 22

Annex C (informative) Information on bonding operations with one-component

polyurethane adhesives in combination with water-spraying .......................................... 23

Bibliography ....................................................................................................................................................... 24

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SIST EN 15425:2023
EN 15425:2023 (E)
European foreword

This document (EN 15425:2023) has been prepared by Technical Committee CEN/TC 193 “Adhesives”,

the secretariat of which is held by UNE.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by August 2023, and conflicting national standards shall be

withdrawn at the latest by August 2023.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 15425:2017.

EN 15425:2023 includes the following significant technical changes with respect to EN 15425:2017:

a) for adhesive type “Special purpose”, the test according to EN 302-8 is performed with a bond line

thickness of 0,5 mm;
b) an additional adhesive subtype I-SP-70-0,5 has been added in Table 1;

c) for adhesive type FJ, the test according to EN 302-2 is required only with short closed assembly time,

and the test according to EN 15416-5 is only required with thin glue line;

d) for finger joint delamination tests on additional wood species, the reference to EN 301 has been

replaced by a new Annex B;

e) for the delamination test according to EN 302-2 with preservative treated wood, a test with Scots

pine (Pinus sylvestris) and silver fir (Abies alba) covers also Norway spruce (Picea abies L.);

f) the description of the test procedure for an “adhesive line” has been modified;

g) the description of a test procedure when a primer is used in all bonding operations has been added

in Clause 4;

h) provisions and maximum tolerance for testing and application of a primer have been added in 5.1;

i) information on water spraying has been included in the scope and as a new Annex C.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,

Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United

Kingdom.
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SIST EN 15425:2023
EN 15425:2023 (E)
Introduction

This document is one of a series dealing with one component polyurethane adhesives for use with timber

structures, and is published in support of product standards for load-bearing timber structures in

connection with EN 1995-1-1, Eurocode 5: Design of timber structures — Part 1-1: General — Common

rules and rules for buildings.
The series consists of:
— one standard for classification and performance requirements (EN 15425);

— eight test methods (EN 302-1, EN 302-2, EN 302-3, EN 302-4, EN 302-8, EN 15416-1 (“Glass house

test”), EN 15416-3 and Annex B of this document) used to assess the performance of adhesives after

specified heat and humidity treatments; and

— three test methods (EN ISO 2555 (reference in EN 302-7), EN 15416-4, and EN 15416-5) to

characterize the working properties of the adhesives.
Safety statement

Persons using this document should be familiar with the normal laboratory practice, if applicable. This

document cannot address all of the safety problems, if any, associated with its use. It is the responsibility

of the user to establish appropriate safety and health practices and to ensure compliance with any

regulatory conditions.
Environmental statement

It is understood that some of the material permitted in this document may have negative environmental

impact. As technological advantages lead to better alternatives for these materials, they will be eliminated

from this European Standard to the extent possible.

At the end of the test, it is recommended that the users of this document take care to carry out an

appropriate disposal of the wastes, according to local regulations.
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SIST EN 15425:2023
EN 15425:2023 (E)
1 Scope

This document establishes a classification for one component polyurethane (PUR) adhesives according

to their suitability for use in load-bearing timber products in defined climatic exposure conditions, and

specifies performance requirements for such adhesives for the factory manufacture or factory-like

manufacturing of load-bearing timber products only.

It also classifies “adhesive product lines” where all the products within the line have the same chemical

composition except for a different amount of catalyst.

This document only specifies the performance of adhesives for use in an environment corresponding to

the defined conditions.

The performance requirements of this document are applicable to the adhesives only, not to the

manufactured timber products. This document does not cover the performance of adhesives for on-site

gluing (except for factory-like conditions) or the production of wood-based panels, except solid wood

panels, or modified and stabilized wood with considerably reduced swelling and shrinkage properties,

e.g. acetylated wood, heat treated wood and polymer impregnated wood.

This document is primarily intended for use by adhesive manufacturers and for use in timber products

bonded with adhesives, to assess or control the quality of adhesives. The requirements are applicable to

the type testing of the adhesives. Production control activities are outside the scope of this document.

Adhesives meeting the requirements of this document are adequate for use in load-bearing timber

products, provided that the bonding process has been carried out according to an appropriate product

standard.

This document does not address the classification and use of adhesives in combination with the spraying

of water before or during the bonding process; see informative Annex C of this document.

This does neither allow nor forbid the use of adhesives in combination with the spraying of water.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 302-1, Adhesives for load-bearing timber structures — Test methods — Part 1: Determination of

longitudinal tensile shear strength

EN 302-2, Adhesives for load-bearing timber structures — Test methods — Part 2: Determination of

resistance to delamination

EN 302-3, Adhesives for load-bearing timber structures — Test methods — Part 3: Determination of the

effect of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength

EN 302-4, Adhesives for load-bearing timber structures — Test methods — Part 4: Determination of the

effects of wood shrinkage on the shear strength

EN 302-8, Adhesives for load-bearing timber structures — Test methods — Part 8: Static load test of

multiple bond line specimens in compression shear
EN 923, Adhesives — Terms and definitions

EN 13183-2, Moisture content of a piece of sawn timber — Part 2: Estimation by electrical resistance

method
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SIST EN 15425:2023
EN 15425:2023 (E)

EN 13183-3, Moisture content of a piece of sawn timber — Part 3: Estimation by capacitance method

EN 14080, Timber structures — Glued laminated timber and glued solid timber — Requirements

EN 15416-1, Adhesives for load bearing timber structures other than phenolic and aminoplastic — Test

methods — Part 1: Long-term tension load test perpendicular to the bond line at varying climate conditions

with specimens perpendicular to the glue line (Glass house test)

EN 15416-3, Adhesives for load bearing timber structures other than phenolic and aminoplastic — Test

methods — Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending

shear

EN 15416-4, Adhesives for load bearing timber structures other than phenolic and aminoplastic — Test

methods — Part 4: Determination of open assembly time under referenced conditions

EN 15416-5, Adhesives for load bearing timber structures other than phenolic and aminoplastic — Test

methods — Part 5: Determination of minimum pressing time under referenced conditions

EN ISO 2555, Plastics — Resins in the liquid state or as emulsions or dispersions — Determination of

apparent viscosity using a single cylinder type rotational viscometer method (ISO 2555)

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 923 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
one component polyurethane (PUR) adhesive

isocyanate containing urethane polymers, which are cross-linked by reaction with water

3.2
service class 1

climatic conditions characterized by a moisture content in the materials corresponding to a temperature

of 20 °C and the relative humidity of the surrounding air only exceeding 65 % for a few weeks per year

Note 1 to entry: In service class 1, which comprises typical indoor conditions, the average moisture content in most

soft woods will not exceed 12 %.

[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Indoor conditions have been added in Note 1 to entry.]

3.3
service class 2

climatic conditions characterized by a moisture content in the materials corresponding to a temperature

of 20 °C and the relative humidity of the surrounding air only exceeding 85 % for a few weeks per year

Note 1 to entry: In service class 2, to which most covered exterior conditions belong, the average moisture content

in most soft woods will not exceed 20 %.

[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Covered exterior conditions have been added in Note 1

to entry.]
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SIST EN 15425:2023
EN 15425:2023 (E)
3.4
service class 3
climatic conditions leading to higher moisture contents than in service class 2
Note 1 to entry: Exterior conditions typically belong to service class 3.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Note 1 to entry has been added.]
3.5
glue line
adhesive layer between the wood members
3.6
bond line
glue line including the two intermediate zones between adhesive and wood
3.7
close contact glue line
glue line of thickness maximum 0,1 mm

Note 1 to entry: Close contact glue line can be achieved by pressing together two plane wood members with a

clamping pressure of (0,8 ± 0,1) N/mm without additional groves, spacers or similar devices.

3.8
thick glue line

glue line of nominal thickness in the range of 0,3 mm to 1,0 mm at the time of bonding

Note 1 to entry: Thick glue lines are achieved by using spacers, grooves or similar devices when two plain members

are glued together.
3.9
adhesive product line

series of products, all with the same chemical composition except for a different amount of catalyst

Note 1 to entry: Only for this reason the products have different reactivity.
3.10
primer treatment

application of a coating (primer) substance to both adherend surfaces, prior to the application of an

adhesive to improve adhesion and/or durability of the bond
Note 1 to entry: This does not include application of pure water.
4 Classification

Adhesives for structural purpose shall produce joints of such strength and durability that the integrity of

the bond is maintained in the assigned service class throughout the expected life of the structure.

PUR-adhesives according to EN 15425 are classified by type (climate condition in use), maximum test

temperature and maximum glue line thickness in use. These three classification criteria are subdivided

as follows.
Type I: to be used in service classes 1, 2 and 3.
Type II: to be used in service class 1 only.
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SIST EN 15425:2023
EN 15425:2023 (E)
Maximum test temperature: 50 °C, 70 °C or 90 °C.
Maximum glue line thickness in use: 0,1 mm, 0,3 mm and 0,5 mm.

Depending on the maximum glue line thickness in use, the adhesives are assigned to different application

areas as described below and shown in Table 1.

— Special purpose adhesives (SP): to be used for glue lines between laminations (maximum glue line

thickness 0,5 mm) and for finger-joints in laminations and structural timber.

— General purpose adhesives (GP): to be used for glue lines between laminations (maximum glue

line thickness 0,3 mm) and for finger-joints in laminations and structural timber.

— Finger-jointing adhesives (FJ): to be used for finger-jointing of laminations and structural timber

only (maximum glue line thickness 0,1 mm).

NOTE The definition of “Special purpose”, “General purpose” and “Type” can be different in other standards.

Each area of application and use shall be given in the designation code of the adhesive.

Table 1 — Adhesive classes
Adhesive class Application Max. test Max. glue line Service classes
(designation code) area temperature thickness
Test Use
°C mm mm
Normal use
General purpose
EN 15425 I 70 GP 0,3
70 0,5 0,3 1, 2, 3
Special use
Special purpose 90 1,0 0,5 1, 2, 3
EN 15425 I 90 SP 0,5
Special purpose 70 1,0 0,5 1, 2, 3
EN 15425 I 70 SP 0,5
General purpose 90 0,5 0,3 1, 2, 3
EN 15425 I 90 GP 0,3
Finger-jointing 90 0,3 0,1 1, 2, 3
EN 15425 I 90 FJ 0,1
Finger-jointing 70 0,3 0,1 1, 2, 3
EN 15425 I 70 FJ 0,1
General purpose 50 0,5 0,3 1
EN 15425 II 50 GP 0,3
Finger-jointing 50 0,3 0,1 1
EN 15425 II 50 FJ 0,1
Tested according to EN 302-8 and Annex A, designation A6, A7 or A8.

The application of the adhesive types in the different service classes can be restricted by national regulations

applicable at the end use site of the bonded timber structures.

A classification to a certain “maximum test temperature” will automatically be valid for lower

temperatures.

Table 2 specifies the tests that shall be performed for each application area. References are given to the

actual subclause in this document and to the European Standard the tests are based on.

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SIST EN 15425:2023
EN 15425:2023 (E)
Table 2 — Necessary tests for adhesives used in different application areas
Glue line EN 302-1 EN 302-2 EN 302-3 EN 302-4 EN 302-8 EN 15416-3 EN 15416-1
Application
thickness (based (based (based (based (based (based (based
area
a b c
in test on 6.2) on 6.3) on 6.4) on 6.5) on 6.6) on 6.7) on 6.8)
0,1 X X X
Special
0,5 X X X X X X
purpose
1,0 X
0,1 X X X X
General
0,3 X
purpose
0,5 X X X X
d e
0,1 X X X X X X
Finger-
jointing
0,3 X

Climate treatment A1 to A5 and A6 or A7 or A8, depending on maximum test temperature (see Table 1 and

Annex A).
Only for wood surface treated with a primer with pH-value less than 3.
Maximum test temperature according to Table 1.
As defined in 3.6, close contact.
Test only with short closed assembly time.

When testing an adhesive product line within one of the three application areas given in Table 2, the test

program shall be as follows:

— full scale testing of the slowest product and the fastest product in the adhesive product line according

to the test methods listed in Table 2. For determination of the working properties, testing according

to Clause 7 shall be performed;

— partly testing of the product closest to the mean reactivity will be performed according to EN 302-1

based on 6.2, EN 302-2 based on 6.3 and EN 302-8 based on 6.6. For determination of the working

properties, testing according to 7.3 and 7.4 shall be performed;

— if a primer treatment is used before the bonding of specific wood species, the required tests for the

primer treatment (see Table 2 and 5.1) shall be performed with the fastest and the slowest product

of the adhesive product line;

— if an adhesive line is intended for bonding of face laminations and finger-joints in other wood species

than Norway spruce (Picea abies L.)/silver fir (Abies alba)/Scots pine (Pinus sylvestris), the required

test according to EN 302-2 shall be performed with the fastest and the slowest product of the

adhesive line;

— if an adhesive line is only intended for bonding of finger-joints in other wood species than Norway

spruce (Picea abies L.)/silver fir (Abies alba)/Scots pine (Pinus sylvestris), the test according to

EN 302-2 may be replaced by the test according to Annex B with the fastest product of the adhesive

line.
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SIST EN 15425:2023
EN 15425:2023 (E)

When testing an adhesive or an adhesive line within the application area General purpose or Special

purpose according to Table 2 using a primer in all classification tests, the primer shall be used within all

bonding operations of load bearing timber products made of wood species Norway spruce (Picea

abies L.), silver fir (Abies alba) or Scots pine (Pinus sylvestris). In addition, the following provisions apply:

— for the bonding of additional wood species using a primer, the test according to EN 302-2 shall be

performed with these wood species. In case of an adhesive line, the test shall be performed with the

fastest and the slowest product;

— for the bonding of finger joints in wood species Spruce (Picea abies L.), silver fir (Abies alba) or Scots

pine (Pinus sylvestris) without using a primer, the test according to EN 302-1 based on 6.2, storage

treatment A1, A4 and A5 and the finger-joint delamination test according to Annex B with Norway

spruce (Picea abies L.), Silver fir (Abies alba) or Scots pine (Pinus sylvestris) shall be performed

additionally without a primer. In case of an adhesive line, these tests shall be performed with the

fastest and the slowest product used for finger-joints;

— if an adhesive in addition is intended for the bonding of finger-joints in other wood species than

Norway spruce (Picea abies L.)/silver fir (Abies alba)/Scots pine (Pinus sylvestris) without using a

primer, the test according to Annex B has to be performed without using a primer on these other

wood species. In case of an adhesive line, the test shall be performed with the fastest product.

Adhesives tested for working properties according to Clause 7 are specified by the letter “w” at the end

of the designation code (example: EN 15425 I 70 GP 0,3 w).
5 Requirements
5.1 General

Adhesives complying with this document shall meet the performance requirements specified in 5.2 to 5.9

when tested in accordance with Table 2 and the following test methods:

a) The tensile shear test (see 5.2 and 6.2) using bonded test pieces made from beech (Fagus sylvatica L.).

Is the wood surface treated with a primer only for the bonding of additional wood species, additional

tests according to EN 302-1, storage treatment A1, A4 and A5 shall be performed with the primer.

b) The delamination test (see 5.3 and 6.3) on bonded test pieces made from Norway spruce (Picea

abies L.). The test with Norway spruce (Picea abies L.) also covers silver fir (Abies alba) and Scots

pine (Pinus sylvestris). If
...

SLOVENSKI STANDARD
oSIST prEN 15425:2022
01-marec-2022
Lepila - Enokomponentni poliuretan (PUR) za nosilne lesene konstrukcije -
Razvrstitev in zahtevane lastnosti

Adhesives - One component polyurethane (PUR) for load-bearing timber structures -

Classification and performance requirements
Klebstoffe - Einkomponenten-Klebstoffe auf Polyurethanbasis (PUR) für tragende
Holzbauteile - Klassifizierung und Leistungsanforderungen

Adhésifs - Adhésifs polyuréthane monocomposants (PUR) pour structures portantes en

bois - Classification et exigences de performance
Ta slovenski standard je istoveten z: prEN 15425
ICS:
83.180 Lepila Adhesives
91.080.20 Lesene konstrukcije Timber structures
oSIST prEN 15425:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 15425:2022
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oSIST prEN 15425:2022
DRAFT
EUROPEAN STANDARD
prEN 15425
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2021
ICS 83.180 Will supersede EN 15425:2017
English Version
Adhesives - One component polyurethane (PUR) for load-
bearing timber structures - Classification and performance
requirements

Adhésifs - Adhésifs polyuréthane monocomposants Klebstoffe - Einkomponenten-Klebstoffe auf

(PUR) pour structures portantes en bois - Classification Polyurethanbasis (PUR) für tragende Holzbauteile -

et exigences de performance Klassifizierung und Leistungsanforderungen

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 193.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15425:2021 E

worldwide for CEN national Members.
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oSIST prEN 15425:2022
prEN 15425:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 7

4 Classification ..................................................................................................................................................... 8

5 Requirements ................................................................................................................................................ 11

5.1 General ............................................................................................................................................................. 11

5.2 Bond strength in longitudinal tensile shear test .............................................................................. 12

5.3 Resistance to delamination ...................................................................................................................... 13

5.4 Tensile strength perpendicular to the bond line after climatic treatment (acid

damage test) ................................................................................................................................................... 13

5.5 Effect of wood shrinkage on the shear strength................................................................................ 13

5.6 Static load test of multiple bond line specimens in compression shear .................................. 13

5.7 Creep deformation test at cyclic climate conditions with specimens loaded in

bending shear ................................................................................................................................................ 14

5.8 Long-term sustained load test at cyclic climate conditions with specimens loaded

perpendicular to the bond line (“Glass house test”) ....................................................................... 14

5.9 Delamination test on finger-jointed test pieces ................................................................................ 14

6 Test methods ................................................................................................................................................. 15

6.1 General ............................................................................................................................................................. 15

6.2 Determination of longitudinal tensile shear strength .................................................................... 15

6.3 Determination of resistance to delamination .................................................................................... 15

6.4 Determination of tensile strength perpendicular to the bond line after climatic

treatment (acid damaged test) ................................................................................................................ 15

6.5 Determination of the effect of wood shrinkage on the shear strength ..................................... 15

6.6 Static load test of multiple bond line specimens in compression shear .................................. 15

6.7 Creep deformation test with specimens loaded in bending shear ............................................. 16

6.8 Long-term sustained load test at cyclic climate conditions with specimens loaded

perpendicular to the bond line (“Glass house test”) ....................................................................... 16

6.9 Delamination test on finger-jointed test pieces ................................................................................ 16

7 Working properties of the adhesive ...................................................................................................... 16

7.1 General ............................................................................................................................................................. 16

7.2 Determination of initial viscosity under reference conditions ................................................... 16

7.3 Determination of open assembly time under reference conditions.......................................... 16

7.4 Determination of pressing time under reference conditions ...................................................... 17

8 Marking and labelling ................................................................................................................................. 17

Annex A (normative) Climatic treatment prior to shear test .................................................................... 18

Annex B (normative) Delamination test for bonding of finger-joints .................................................... 19

B.1 Production of the specimens .................................................................................................................... 19

B.2 Testing .............................................................................................................................................................. 20

B.3 Expression of results ................................................................................................................................... 20

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oSIST prEN 15425:2022
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Annex C (informative) Information on bonding operations with one-component

polyurethane adhesives in combination with water-spraying .................................................... 21

Bibliography ................................................................................................................................................................. 22

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oSIST prEN 15425:2022
prEN 15425:2021 (E)
European foreword

This document (prEN 15425:2021) has been prepared by Technical Committee CEN/TC 193 “Adhesives”,

the secretariat of which is held by UNE.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15425:2017.
Compared to EN 15425:2017, the following main changes have been made:

a) for adhesive type “Special purpose” the test according to EN 302-8 is performed with a bond line

thickness of 0,5 mm;
b) an additional adhesive subtype I-SP-70-0,5 has been added in Table 1;

c) for adhesive type FJ the test according to EN 302-2 is required only with short closed assembly time,

and the test according to EN 15416-5 is only required with thin glue line;

d) for finger joint delamination tests on additional wood species the reference to EN 301 has been

replaced by a new Annex B;

e) for the delamination test according to EN 302-2 with preservative treated wood a test with Scots

pine (Pinus sylvestris) and silver fir (Abies alba) covers also Norway spruce (Picea abies L.);

f) description of the test procedure for an "adhesive line" modified;

g) description of a test procedure when a primer is used in all bonding operations added in Clause 4;

h) provisions and maximum tolerance for testing and application of a primer added in 5.1;

i) information on water spraying included in the scope and as a new Annex C.

This document is one of a series dealing with one component polyurethane adhesives for use with timber

structures, and is published in support of EN 1995-1-1, Eurocode 5: Design of timber structures —

Part 1-1: General — Common rules and rules for buildings.
The series consists of:
— one standard for classification and performance requirements (EN 15425);

— eight test methods (EN 302-1, EN 302-2, EN 302-3, EN 302-4, EN 302-8, EN 15416-1 (“Glass house

test”), EN 15416-3 and Annex B of this document) used to assess the performance of adhesives after

specified heat and humidity treatments; and

— three test methods (EN ISO 2555 (reference in EN 302-7), EN 15416-4, and EN 15416-5) to

characterize the working properties of the adhesives.
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oSIST prEN 15425:2022
prEN 15425:2021 (E)
Introduction
Safety statement

Persons using this document should be familiar with the normal laboratory practice, if applicable. This

document cannot address all of the safety problems, if any, associated with its use. It is the responsibility

of the user to establish appropriate safety and health practices and to ensure compliance with any

regulatory conditions.
Environmental statement

It is understood that some of the material permitted in this document may have negative environmental

impact. As technological advantages lead to better alternatives for these materials, they will be eliminated

from this European Standard to the extent possible.

At the end of the test, it is recommended that the user of this document take care to carry out an

appropriate disposal of the wastes, according to local regulation.
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1 Scope

This document establishes a classification for one component polyurethane (PUR) adhesives according

to their suitability for use in load-bearing timber products in defined climatic exposure conditions; it

specifies performance requirements for such adhesives for the factory manufacture or factory like

manufacturing of load-bearing timber products only.

It also classifies “adhesive lines” where all the products within the line have almost identical

physical/chemical properties and gluing performance, but different reactivity.

This document only specifies the performance of adhesives for use in an environment corresponding to

the defined conditions.

The performance requirements of this document apply to the adhesives only, not to the manufactured

timber products. This document does not cover the performance of adhesives for on-site gluing (except

for factory-like conditions) nor the production of wood-based panels, except solid wood panels, or

modified and stabilized wood with considerably reduced swelling and shrinkage properties, e.g. such as

acetylated wood, heat treated wood and polymer impregnated wood.

This document is primarily intended for the use of adhesive manufacturers and for the use in timber

products bonded with adhesives, to assess or control the quality of adhesives. The requirements apply to

the type testing of the adhesives. Production control activities are outside the scope of this document.

Adhesives meeting the requirements of this document are adequate for use in load-bearing timber

products, provided that the bonding process has been carried out according to an appropriate product

standard.

This document does not address the classification and use of adhesives in combination with the spraying

of water before or during the bonding process; see informative Annex C of this document.

This does neither allow nor forbid the use of adhesives in combination with spraying of water.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 302-1, Adhesives for load-bearing timber structures - Test methods - Part 1: Determination of

longitudinal tensile shear strength

EN 302-2, Adhesives for load-bearing timber structures - Test methods - Part 2: Determination of resistance

to delamination

EN 302-3, Adhesives for load-bearing timber structures - Test methods - Part 3: Determination of the effect

of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength

EN 302-4, Adhesives for load-bearing timber structures - Test methods - Part 4: Determination of the effects

of wood shrinkage on the shear strength

EN 302-7, Adhesives for load-bearing timber structures - Test methods - Part 7: Determination of the

working life under referenced conditions

EN 302-8, Adhesives for load-bearing timber structures - Test methods - Part 8: Static load test of multiple

bond line specimens in compression shear
EN 923:2015, Adhesives - Terms and definitions
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oSIST prEN 15425:2022
prEN 15425:2021 (E)

EN 13183-2, Moisture content of a piece of sawn timber - Part 2: Estimation by electrical resistance method

EN 13183-3, Moisture content of a piece of sawn timber - Part 3: Estimation by capacitance method

EN 14080, Timber structures - Glued laminated timber and glued solid timber - Requirements

EN 15416-1, Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test

methods - Part 1: Long-term tension load test perpendicular to the bond line at varying climate conditions

with specimens perpendicular to the glue line (Glass house test)

EN 15416-3, Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test

methods - Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending shear

EN 15416-4, Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test

methods - Part 4: Determination of open assembly time under referenced conditions

EN 15416-5, Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test

methods - Part 5: Determination of minimum pressing time under referenced conditions

EN ISO 2555, Plastics - Resins in the liquid state or as emulsions or dispersions - Determination of apparent

viscosity using a single cylinder type rotational viscometer method (ISO 2555)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 923:2015 and the following

apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
one component polyurethane (PUR) adhesive

isocyanate containing urethane polymers, which are cross-linked by reaction with water

3.2
service class 1

climatic conditions characterized by a moisture content in the materials corresponding to a temperature

of 20 °C and the relative humidity of the surrounding air only exceeding 65 % for a few weeks per year

Note 1 to entry: In service class 1, which comprises typical indoor conditions, the average moisture content in

most soft woods will not exceed 12 %.

[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Indoor conditions added in Note 1 to entry]

3.3
service class 2

climatic conditions characterized by a moisture content in the materials corresponding to a temperature

of 20 °C and the relative humidity of the surrounding air only exceeding 85 % for a few weeks per year

Note 1 to entry: In service class 2, to which most covered exterior conditions belong, the average moisture

content in most soft woods will not exceed 20 %.
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oSIST prEN 15425:2022
prEN 15425:2021 (E)

[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Covered exterior conditions added in Note 1 to entry]

3.4
service class 3
climatic conditions leading to higher moisture contents than in service class 2
Note 1 to entry: Exterior conditions typically belong to service class 3.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Note 1 to entry has been added]
3.5
glue line
adhesive layer between the wood members
3.6
bond line
glue line including the two intermediate zones between adhesive and wood
3.7
close contact glue line
glue line of thickness maximum 0,1 mm in the test

Note 1 to entry: Close contact glue line can be achieved by gluing together two plane wood members with a

clamping pressure of (0,8 ± 0,1) N/mm without groves, spacers or similar device.
3.8
thick glue line
glue line of nominal thickness in the range of 0,3 mm to 1,0 mm in the test

Note 1 to entry: Thick glue lines are achieved by using spacers, grooves or similar device with a thickness of

0,3 mm to 1,0 mm when two plain members are glued together.
3.9
adhesive product line

series of products, all with the same chemical composition except for a different amount of catalyst

Note 1 to entry: Only for this reason the products have different reactivity.
3.10
primer treatment

application of a coating (primer) substance to both adherend surfaces, prior to the application of an

adhesive to improve adhesion and/or durability of the bond
Note 1 to entry: This does not include application of pure water.
4 Classification

Adhesives for structural purpose shall produce joints of such strength and durability that the integrity of

the bond is maintained in the assigned service class throughout the expected life of the structure.

PUR-adhesives according to EN 15425 are classified by type (climate condition in use), maximum test

temperature and maximum glue line thickness in use. These three subclasses are subdivided as follows.

Type l: to be used in service classes 1, 2 and 3.
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oSIST prEN 15425:2022
prEN 15425:2021 (E)
Type ll: to be used in service class 1 only.
Maximum test temperature: 50 °C, 70 °C or 90 °C.
Maximum glue line thickness in use: 0,1 mm, 0,3 mm and 0,5 mm.

Depending on the maximum glue line thickness in use, the adhesives are assigned to different application

areas as described below and shown in Table 1.

— Special purpose adhesives (SP): to be used for glue lines between laminations (maximum glue line

thickness 0,5 mm) and for finger-joints in laminations.

— General purpose adhesives (GP): to be used for glue lines between laminations (maximum glue

line thickness 0,3 mm) and for finger-joints in laminations.

— Finger-jointing adhesives (FJ): to be used for finger-jointing of laminations and structural timber

only (maximum glue line thickness 0,1 mm).

Definition of Special purpose, General purpose and Type can be different in other European Standards.

Each area of application and use shall be given in the designation code of the adhesive.

Table 1 — Adhesive classes
Adhesive type Application Max. test Max. glue line Service classes
designation area temperature thickness
Test Use
°C mm mm
Normal use
General purpose
EN 15425 l 70 GP 0,3
70 0,5 0,3 1, 2, 3
Special use
Special purpose 90 1,0 0,5 1, 2, 3
EN 15425 l 90 SP 0,5
Special purpose 70 1,0 0,5 1, 2, 3
EN 15425 l 70 SP 0,5
General purpose 90 0,5 0,3 1, 2, 3
EN 15425 l 90 GP 0,3
Finger-jointing 90 0,3 0,1 1, 2, 3
EN 15425 l 90 FJ 0,1
Finger-jointing 70 0,3 0,1 1, 2, 3
EN 15425 l 70 FJ 0,1
General purpose 50 0,5 0,3 1
EN 15425 ll 50 GP 0,3
Finger-jointing 50 0,3 0,1 1
EN 15425 ll 50 FJ 0,1
Tested according to EN 302–8:2017 and Annex A designation A6, A7 or A8.

The application of the adhesive types in the different service classes can be restricted by national regulations

applicable at the end use site of the bonded timber structures.

A classification to a certain “maximum test temperature” will automatically be valid for lower

temperatures.

Table 2 specifies the tests that shall be performed for each application area. References are given to the

actual subclause in this document and to which European Standard the tests are based on.

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Table 2 — Necessary tests for adhesives used in different application areas
mm
0,1 X X X
Special
0,5 X X X X X X
Purpose
1,0 X
0,1 X X X X
General
0,3 X
purpose
0,5 X X X X
d e
0,1 X X X X X X
Finger-
jointing
0,3 X

Climate treatment A1 to A5 and A6 or A7 or A8, depending on maximum test temperature (see Table 1 and

Annex A).
Only for wood surface treated with a primer with pH-value less than 3.
Maximum test temperature according to Table 1.
As defined in 3.6, close contact.
Test only with short closed assembly time.

When testing an adhesive product line within one of the three application areas given in Table 2, the test

program shall be as follows:

— full scale testing of the slowest product and the fastest product in the adhesive product line according

to the test methods listed in Table 2. For determination of the working properties, testing according

to paragraph 7 shall be performed;

— partly testing of the product closest to the mean reactivity will be performed according to EN 302-1

based on 6.2, EN 302-2 based on 6.3 and EN 302-8 based on 6.6. For determination of the working

properties, testing according to 7.3 and 7.4 shall be performed;

— if a primer treatment is used before the bonding of specific wood species , the required tests for the

primer treatment (see Table 2 and 5.1) shall be performed with the fastest and the slowest product

of the adhesive product line;

— if an adhesive line is intended for bonding of face laminations and finger-joints in other wood species

than Norway spruce (Picea abies L.)/silver fir (Abies alba)/Scots pine (Pinus sylvestris), the required

test according to EN 302-2 shall be performed with the fastest and the slowest product of the

adhesive line;

— if an adhesive line is only intended for bonding of finger-joints in other wood species than Norway

spruce (Picea abies L.)/silver fir (Abies alba)/Scots pine (Pinus sylvestris), the test according to

EN 302-2 may be replaced by the test according to Annex B with the fastest product of the adhesive

line.
Application area
Glue line thickness
in test
EN 302-1
(based on 6.2)
EN 302-2
(based on 6.3)
EN 302-3
(based on 6.4)
EN 302-4
(based on 6.5)
EN 302-8
(based on 6.6)
EN 15416-3
(based on 6.7)
EN 15416-1
(based on 6.8)
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oSIST prEN 15425:2022
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When testing an adhesive or an adhesive line within the application area General Purpose or Special

purpose according to Table 2 using a primer in all classification tests, the primer shall be used within all

bonding operations of load bearing timber products made of wood species Norway spruce (Picea

abies L.), silver fir (Abies alba) or Scots pine (Pinus sylvestris). In addition, the following provisions apply:

— For the bonding of additional wood species using a primer, the test according to EN 302-2 shall be

performed with these wood species. In case of an adhesive line, the test shall be performed with the

fastest and the slowest product.

— For the bonding of finger joints in wood species Spruce (Picea abies L.), silver fir (Abies alba) or Scots

pine (Pinus sylvestris) without using a primer, the test according to EN 302-1 based on 6.2, storage

treatment A1, A4 and A5 and the finger-joint delamination test according to Annex B with Norway

spruce (Picea abies L.), Silver fir (Abies alba) or Scots pine (Pinus sylvestris) shall be performed

additionally without a primer.

— In case of an adhesive line, these tests shall be performed with the fastest and the slowest product

used for finger-joints.

— If an adhesive in addition is intended for the bonding of finger-joints in other wood species than

Norway spruce (Picea abies L.)/silver fir (Abies alba)/Scots pine (Pinus sylvestris) without using a

primer, the test according to Annex B has to be performed without using a primer on these other

wood species. In case of an adhesive line, the test shall be performed with the fastest product.

Adhesives tested for working properties according to Clause 7 are specified by the letter “w” at the end

of the designation code (example: EN 15425 l 70 GP 0,3 w).
5 Requirements
5.1 General

Adhesives complying with this document shall meet the performance requirements specified in 5.2 to 5.9

when tested in accordance with Table 2 and the following test methods:

a) The tensile shear test (see 5.2 and 6.2) using bonded test pieces made from beech (Fagus sylvatica L.).

Is the wood surface treated with a primer only for the bonding of additional wood species, additional

tests according to EN 302-1, storage treatment A1, A4 and A5 shall be performed with the primer.

b) The delamination test (see 5.3 and 6.3) on bonded test pieces made from Norway spruce (Picea

abies L.). The test with Norway spruce (Picea abies L.) also covers silver fir (Abies alba) and Scots pine

(Pinus sylvestris). If the adhesive is to be used on wood from other conifers species, from hardwood

species, preservative treated wood and/or wood surface-treated with a primer, also prepare four

laminated members using representative samples from those species or wood treated that way.

The test with representative samples of preservative treated Scots pine (Pinus sylvestris) or silver fir

(Abies alba) also covers preservative treated Norway spruce (Picea abies L.). In case of an adhesive

of application area finger-jointing shall be used for the bonding of wood species other than Norway

spruce (Picea abies L.), silver fir (Abies alba) and Scots pine (Pinus sylvestris), the additional

delamination test according to EN 302-2 may be replaced by the delamination test described in

Annex B (delamination test for finger-joints in laminations, see 5.9 and 6.9).

c) In case of wood being surface-treated with a primer with pH-value lower than 3,0, the acid damage

test (EN 302-3, see 5.4 and 6.4) on bonded test pieces made from surface treated Norway spruce

(Picea abies L.) shall be performed.

d) The shrinkage stress test (EN 302-4, see 5.5 and 6.5) on bonded test pieces made from Norway

spruce (Picea abies L.).
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